NJDEP - NJGS - First Annual Report of the Geological Survey of the ...

4_the foot of a sandstone ridge. Its origin may b 9 undoubtedlytraced.to the iron pyrites which abounds in the Samlstml_ s andgrim of this' .mountain_ and which, being" decomposed, is car.tied d_w'n by tlLe wuter_ arid deposited in the low_ swampylands situated at the base of the ridges.•iPOGII UCK_IINE.Two miles nnd a half northeast of Hamburgh, betw_'en thebase of' t le Poehuck Mountuiu. . mid a ridge of _!'hite ]imcstlmc_occurs tin extensive bed of brown hematite in stalactitic, inamilhmyand bc_tryoidal fi,rms, of t_fibrous and massive structure.Excsvati.ns have beam made on the surfaee_ two) hun-"dred ym'ds in I,readth, and from sixty to eighty feet in depth 7from which large qu:mtities of ore have beeu tak_.n, m_dsme]tc_t iu the llamburgh Furmtee. The greater part ()f the'ore _)_:cuJ_iu eoncrctionary masses embedded in clay aml saedjalso i. I_cds of'clay of' varitms et,lors_ which have been tbrmedby tim deeomp_sition of a qJmrtzose feldspl_tbi_ rock. L:_rgemasses t_f a quartzose reek, of a honeycomb 9r cellular structure,eoatais_i_J, tibrous limonite of a very pure quality, areassociated with tile ubove_ haviug been apparently subjected *to an iatelJse heat. rl'his mine has not been worked fbr anumber of years, on accoeag of gre_ dep!'cssion in tile ironbusiness.EDSALL},1INE.• . Two miles northeast of Upper Hamburg ' rb _another extcnsirebed of llmonite has been worked. It is situated in aslight depression between the base of the Wallkill Mountainand a small knob of high!y ferruginons feldspattlic gneiss,:Excavations lmve been made two hundred feet in lengthand breadth on the surSaeei and forty feet in depth. Theore is of the.same" general ehamcter_ and associated with tb:osame soft feldspathie rock as in the Poehuck Mine.NEW JERSEY GEOLOGICAL SURVEY